the answers here sounds right.
For you, and others that might get/have the same problem, I'll cut n'paste mine and stines answers to you from facebook..
"I'm afraid it is the bottle of emulsion. Is it emulsion from Foma?
We had a summer course a few years ago, where we had the same problem. I remember the frustration every time the paper reached the fix. We tried everything, just like you have, and never really figured out the problem. We also tried to open a knew bottle of emulsion with the same result. When we bought some new emulsion, the problem disappeared. The only thing we could think of, was that the whole batch of emulsion was bad...
Foma emulsion is beautiful and cheap compared to other kind of emulsion. Unfortunately, it seems that sometimes it's just bad. I know that the Foma factory will not send emulsion to us directly, because they are aware that sometimes it is not good. We have only tried this once, so we still prefer to use Foma emulsion in spite of this risk.
Did you buy it in a store or at the internet? Try to get a bottle from another batch and lets hope everything will be fine;-)
This will be my suggestion, the way you describe it sound very similar to our expiriences that summer.
and then mine:
"unfortunately I agree with Stine...
It sounds like you have gotten a (rare) bad batch of the emulsion.
I still favour the FOMA emulsion over all others that I know of, due to the quality - the easy worlflow and of course the price!
Once in a while you get this problem, but in my experience it happens quite rarely. fortunately.
What can you use the emulsion for then?
Don't just throw it out.
1: exposed/fogging emulsion can be used as spare emulsion if you need some for retouching.
2: IF you print with the intent to tone the images, then chose an image with quite high contrast - make your print, and then slightly bleach it, following a selenium toning.
Or brown tone the images.
Our brains somehow doesn't see then "grayness" in a picture, if toned... then it just looks to have a nice warm tone overall...
So try and buy a new bottle of emulsion, and use this on the above mentioned situations..."
take care, and don't worry. This is the "risk" we all take when using photographic materials..